you need at least OS 2.0 or it isn't going to work at all. Your sampler should be on SCSI host ID 6, the Zip at 5 and the SCSI Remote ID on 5. Termination dhould be on if it's not connected to the PC. Otherwise you should disable the iomega drivers on your PC to avoid conflicts over controle. You can use iomega guest to load and unload your drivers manually if needed. (this works on a Mac don't know for a PC).
Hope this cures your problem.